CVE-2026-25635

Name: CVE-2026-25635
Creator: NVD / NIST
Published: 2026-02-06T21:16:18.69+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 0.44%

Last modified Jun 17, 2026

CVE-2026-25635 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. calibre is an e-book manager. Prior to 9.2.0, Calibre's CHM reader contains a path traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

Description

calibre is an e-book manager. Prior to 9.2.0, Calibre's CHM reader contains a path traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows (haven't tested on other OS's), this can lead to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. This vulnerability is fixed in 9.2.0.

Metrics

CVSS 3.1

8.6/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Probability

0.44%

35.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Calibre-Ebook	Calibre	< 9.2.0

References

https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9Patch
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxrExploit, Third Party Advisory
https://0x5t.raptx.org/posts/calibre-chm-rceExploit, Third Party Advisory

Timeline

Published: Feb 6, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-25635?

How severe is CVE-2026-25635?

CVE-2026-25635 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2026-25635?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-25635?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST